Improvement in machines for shaping wooden chair-seats



A. P. JOHNSON. MACHINES FOR SHAPING WOODEN CHAIR SEATS. No. 178,157. Patented May 30,1876.

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NJ'ETERS. PHQTO-LITHOGRAPHER. WASHINGTON D C.

UNITED STATES PATENT OFFICE.

ANDREWI. JOHNSON, OF CHICAGO, ILLINOIS.

( IMPROVEMENT IN MACHINES FOR SHAPING WOODEN CHAIR-SEATS.

Specification forming part of Letters Patent No. 198,157, dated May 30, 1876; application filed October 25, 1875.

To all whom it may concern:

Be it known that I, ANDREW P. J OHNSON, of Chicago, in the county of Cook and State of Illinois, have invented an Improvement in Machines for Shaping Wooden Chair-Seats, of which the following is a specification The nature of my invention relates to an improvement in machines for shaping wooden chair-seats; and consists, mainly, in two outter-heads journaled horizontally in a frame, but at right angles with each other, and in a carriage in which the seat-blank is clamped, which carriage moves in ways at the sides of the frame, one way being straight and the other one curved, so as to present the face of the seat to the knives at the proper time to have them remove the material where needed to give the seat its proper shape.

Figure l is a perspective view of the ma chine. Fig. 2 is a cross-section at a: m.

In the drawing, A represents the main frame, across which is journaled an arbor, B,

carrying a cutter-head, O, fitted with curved knivesa, adapted to hollow out the seat of a wooden chair when passed transversely over them.

D is a countershat't journaled along one side of the lower part of the frame, and is driven by a quarter-turn belt, from a pulley on the arbor B.

F is a cutter-head, whose arbor is longitudinally journaled in the frame, and driven by a belt, G, fromthecountershaf It carries a pair of knives, b. The purpose of this cutterhead is to deepen the concave and shape the rim around the depression at the back part of the seat. In certain styles of seats such cutter-head may not be needed, when its drivingbelt may be thrown off the pulley.

H is a straight metal-flanged way at one side of the frame. H is a way of similar construction at the other side of the frame; but its upper surface and flange are curved, as shown. The Way H is adjustable as to elevation with relation to the cutter-heads.

I is an open-frame carriage, having guideclips 0 at each corner, which embrace and slide on the flanges of the ways H H, the latter of In a machine for shaping chair-seats, the

combination, with the frame A, of the curved adjustable guideway H, the straight guideway H, parallel with the guideway H, the

cutter-heads O F, journaled at right angles to 1 each other, and the carriage I, all substantially as described and shown.

' ANDREW P. JOHNSON. Witnesses:

WM. H. Lo'rz, WM. G. HOFFMANN. 

